Green sulfur dye and process of making same.



UNITED STATES latentedioctober 1's, 190s.

PATENT OFFICE. 4

RICHARD GLEY, OF BERLIN, GERMANY, ASSIGNOR TO AOTIEN-GESELL- SCHAFT FUR ANILIN FABRIKATION, OF BERLIN, GERMANY.

GREEN SULFUR DYE AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 741,030, dated October 13, 1903.

' Application filed July 23, 1903. Serial No. 166,759. (No specimens.)

To aZZ whom it may concern:

Be it known that I, RICHARD GLEY, of Berlin, in the Kingdom of Prussia, German Empire, have invented new and useful Improvements in the Production of Green Sulfur Dyes; and I do hereby declare that the following is a full, clear, and exact description of the inventiomwhich will enable others skilled in the art to which it appertains to make and use the same.

I have discovered that the indophenol which is obtained by joint oxidation of alphanaphthylamin and para-amidophenol yields a most valuable sulfur dye when heated with alkali polysulfids in the presence of copper salts. The formation of the dyestuff takes place very readily and may practically be carriedout by boiling in a concentrated aqueous solution.

The following example, in which the parts are by weight, will illustrate the manufactureof the new dyestufi. Ten parts of crystallized sodium sulfid are melted together with four parts of sulfur and the mass is allowed to cool to about 20 to 30, then two parts of the indophenol, which is obtained by joint oxidation of alpho-naphthylamin and para-amidophenol, are added, preferably in form of a paste, and, finally, a concentrated aqueous solution of one part of copper sulfate is introduced. The mixture is kept boiling during twenty-four hours. After this time the mass is diluted with water, filtered, and'the dyestulf is precipitated by the introduction of a current of air. The coloringmatter is filtered, pressed, and dried. It is a dark-green powder which is insoluble in water, easily soluble in alkali sulfide with green color, slightly soluble in caustic alkalies with greenish, in concentrated sulfuric acid naphthylarnin sulfouic acids in which the para position to the amido groupie not substituted.

Having now described. my invention and the manner in which it may be carried out, what I claim isl. The process for the production of a green sulfur dye by heating the indophenol:

with alkalipolysulfids in the presence of copper.

2. The green sulfur dye, obtained as hereinbefore described which is a dark-green powder, insoluble in water, easily soluble in alkali sulfids with a green'color, slightly soluble in concentrated sulfuric acid with bluish, in caustic alkalies with greenish color, dyeing unmordanted cotton green shades, substantially as described.

In witness whereof I have hereunto signed my name, this 9th day of July, 1903, in the presence of two subscribing witnesses.

RICHARD GLEY.

Witnesses WOLDEMAR. HAUPT, HENRY HASPER. 

